Police launched a homicide inquiry after Mr Singh's body was found in scrub and small trees near the old road to the end of Kaiti Beach on the evening of January 24.
He disappeared after leaving his home in Gladstone Rd on December 29.
A scene examination, involving ESR scientists, was completed two days later.
Police publicly identified Mr Singh's Mazda car, registration plate WG5108, during early inquiries into his disappearance, and appealed for information from the public about the vehicle's movements.
Police confirmed the identity of the body at Kaiti Beach on February 5, after a lengthy post-mortem process that involved forensic examination.
Mr Singh's body was released to his family and was taken to South Auckland for a funeral service prior to cremation.
His ashes were returned to India on February 12 by his cousin Atma Sidhu.
They were scattered into a river in the Punjab in northern India on February 16, following a three-day funeral service at his home village.
The Singh family have called for a speedy end to the homicide inquiry and for someone to be arrested and charged.